CN105970077B - A kind of spheroidal graphite cast-iron of high-intensity high-tenacity and preparation method thereof - Google Patents
A kind of spheroidal graphite cast-iron of high-intensity high-tenacity and preparation method thereof Download PDFInfo
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- CN105970077B CN105970077B CN201610497428.0A CN201610497428A CN105970077B CN 105970077 B CN105970077 B CN 105970077B CN 201610497428 A CN201610497428 A CN 201610497428A CN 105970077 B CN105970077 B CN 105970077B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of spheroidal graphite cast-iron of high-intensity high-tenacity, it is made up of the elemental composition of following mass percent：C 3.2 3.5%, Si 2.8 3.3%, Mn 0.5 0.8%, Mo 0.3 0.5%, Mg 0.01 0.03%, Zr 0.02 0.05%, Cr 0.7 1.0%, Ni 0.4 0.6%, V 0.2 0.3%, Cu 0.2 0.3%, RE 0.02 0.04%, surplus are Fe and inevitable impurity.The invention also discloses the preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity.Element and proportioning in reasonably optimizing spheroidal graphite cast-iron of the present invention, the heat treatment mode being alternately cooled using water smoke and air cooling, so that difficult of deformation and cracking after heat treatment, obtained nodular cast iron has good mechanical performance, such as tensile strength, yield strength, impact flexibility, and stability is good.
Description
Technical field
The present invention relates to metallurgical casting field, and in particular to a kind of spheroidal graphite cast-iron of high-intensity high-tenacity and its preparation side
Method.
Background technology
In the flourishing society of present level, the consumption of high-abrasive material is huge.In mine, the row such as electric power, cement, agricultural machinery
Industry, the whole nation also to consume millions of tons of consumable accessory every year, the output value exceeds 100 billion, global resources increasingly exhaustion today, this
It is huge resource consumption.For a long time, domestic and foreign scholars are directed to the New Kind of Anti-Abrasion material of developmental research high-quality to meet
The need for expendable part easy to wear, from ordinary white cast iron, potassium steel, ni-hard cast iron, high-chromium white cast iron etc..Spheroidal graphite cast-iron is 20
Century a kind of high-strength cast iron material for growing up of the fifties, its combination property is close to steel.Phosphorus content in spheroidal graphite cast-iron
At least 3%, globular graphite is obtained after nodularization and inoculation, the mechanical performance of nodular cast iron is effectively improved, especially
It is to improve plasticity and toughness, so as to obtain than carbon steel also high intensity, it is complicated to be successfully used to cast some stress, by force
Degree, toughness, wearability require higher part.However, with industrial expansion, the performance indications of existing nodular cast iron can not
The demand of modern production is met, and in heat treatment process there is the phenomenon such as deformation and cracking in spheroidal graphite cast-iron.
The content of the invention
In view of the shortcomings of the prior art, the invention provides a kind of spheroidal graphite cast-iron of high-intensity high-tenacity and its preparation side
Method, the nodular cast iron of preparation is unlikely to deform cracking after having the performances such as excellent impact flexibility, tensile strength, and heat treatment.
To realize object above, the present invention is achieved by the following technical programs：
A kind of spheroidal graphite cast-iron of high-intensity high-tenacity, is made up of the elemental composition of following mass percent：C 3.2-
3.5%th, Si 2.8-3.3%, Mn 0.5-0.8%, Mo 0.3-0.5%, Mg 0.01-0.03%, Zr 0.02-0.05%, Cr
0.7-1.0%, Ni 0.4-0.6%, V 0.2-0.3%, Cu 0.2-0.3%, RE 0.02-0.04%, surplus are Fe and can not
The impurity avoided.
Preferably, it is made up of the elemental composition of following mass percent：C 3.4%, Si 3.1%, Mn 0.7%, Mo
0.35%th, Mg 0.025%, Zr 0.03%, Cr 0.85%, Ni 0.45%, V0.25%, Cu 0.25%, RE 0.025%,
Surplus is Fe and inevitable impurity.
The preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity, comprises the following steps：
1) raw material is configured, is added it in intermediate frequency furnace, 1000-1020 DEG C is warming up to, 3-5min is kept, then heat up
Melted to 1480-1510 DEG C, obtain original iron melt, come out of the stove；
2) using method is poured in bag, inovulant is covered in nodulizer surface, is placed in the groove of nodularization bag bottom, by nodularization
Bag is preheated to 600-650 DEG C, and iron liquid is injected into nodularization bag and carries out nodularization and an inoculation, when injection rate is more than 2/3
When, add inovulant with stream and carry out late inoculation processing, spheroidization and inoculation treatment temperature is controlled at 1430-1450 DEG C；
3) iron liquid casting after spheroidization and inoculation is handled into sand mold, cast is first slow, in it is fast, rear thin, obtain spheroidal graphite cast-iron；
4) spheroidal graphite cast-iron is heated to 880-920 DEG C, is incubated 2-3h, is then hung ground, low speed rotation, from four
Direction makes its temperature be down to 600-620 DEG C, then be air-cooled to 430-450 DEG C, fill-before-fire water smoke to temperature to spheroidal graphite cast-iron water spray
Degree is down to 200-220 DEG C, then is air-cooled to room temperature；
5) nodular cast iron tempering is heated to 360-380 DEG C, is incubated 2-3h, is air-cooled to room temperature, produces.
Preferably, the step 2) in inovulant be Si-Ba alloy, addition be iron liquid quality 0.5-1.0%, once
The mass ratio for the inovulant that inoculation and late inoculation processing are added is 3-4:2.
Preferably, the step 2) in nodulizer be rare earth ferrosilicomagnesium nodulizer, addition be iron liquid quality 0.8-
1.3%.
Preferably, the step 3) in pouring temperature be 1290-1310 DEG C.
Beneficial effect of the present invention：Element and proportioning in reasonably optimizing spheroidal graphite cast-iron of the present invention, meet the property of spheroidal graphite cast-iron
It can require；Nodularization bag is preheated when during melting to raw material and spheroidization and inoculation, increase raw material melting and spheroidization and inoculation completely
Speed and degree；Technology for Heating Processing is using water smoke and the difference of air cooling cooldown rate, and the casting progress to different temperature sections is alternately cold
But, step is simple, cast-internal cooling is uniform, it is to avoid stress is excessive during structural transformation triggers cracking, the casting after heat treatment
It is unlikely to deform and ftractures；Average tempering further improves its combination property.Nodular cast iron produced by the present invention has good machine
Tool performance, such as tensile strength, yield strength, impact flexibility, and stability are good.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, belongs to the scope of protection of the invention.
Embodiment 1：
A kind of spheroidal graphite cast-iron of high-intensity high-tenacity, is made up of the elemental composition of following mass percent：C 3.4%, Si
3.1%th, Mn 0.7%, Mo 0.35%, Mg 0.025%, Zr 0.03%, Cr 0.85%, Ni 0.45%, V 0.25%, Cu
0.25%th, RE 0.025%, surplus is Fe and inevitable impurity.
The preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity, comprises the following steps：
1) melting：Raw material is configured, is added it in intermediate frequency furnace, 1010 DEG C are warming up to, 5min is kept, then be warming up to
1500 DEG C are melted, and are obtained original iron melt, are come out of the stove；
2) spheroidization and inoculation：Using method is poured in bag, Si-Ba alloy inovulant is covered in rare earth ferrosilicomagnesium nodulizer surface,
Innoculant adding quantity is the 0.6% of iron liquid quality, and nodulizer addition is the 1.1% of iron liquid quality, is placed in nodularization bag bottom recessed
In groove, nodularization bag is preheated to 630 DEG C, iron liquid is injected into nodularization bag and carries out nodularization and an inoculation, works as injection rate
During more than 2/3, the inovulant for adding iron liquid quality 0.4% with stream carries out late inoculation processing, the control of spheroidization and inoculation treatment temperature
At 1440 DEG C；
3) pour into a mould：Iron liquid casting after spheroidization and inoculation is handled into sand mold, cast is first slow, in fast, rear thin, pouring temperature
For 1300 DEG C, spheroidal graphite cast-iron is obtained；
4) quench：Spheroidal graphite cast-iron is heated to 900 DEG C, 2.5h is incubated, is then hung ground, low speed rotation, from four
Individual direction makes its temperature be down to 610 DEG C to spheroidal graphite cast-iron water spray, then is air-cooled to 440 DEG C, and fill-before-fire water smoke to temperature is down to
210 DEG C, then it is air-cooled to room temperature；
5) it is tempered：Nodular cast iron tempering is heated to 370 DEG C, 2.5h is incubated, is air-cooled to room temperature, produces.
Embodiment 2：
A kind of spheroidal graphite cast-iron of high-intensity high-tenacity, is made up of the elemental composition of following mass percent：C 3.3%, Si
3.2%th, Mn 0.6%, Mo 0.4%, Mg 0.02%, Zr 0.035%, Cr 0.8%, Ni 0.55%, V 0.2%, Cu
0.2%th, RE 0.03%, surplus is Fe and inevitable impurity.
The preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity, comprises the following steps：
1) raw material is configured, is added it in intermediate frequency furnace, 1000 DEG C are warming up to, 4min is kept, then be warming up to 1490
DEG C melted, obtain original iron melt, come out of the stove；
2) using method is poured in bag, Si-Ba alloy inovulant is covered in rare earth ferrosilicomagnesium nodulizer surface, inovulant adds
It is the 0.5% of iron liquid quality to enter amount, and nodulizer addition is the 1.2% of iron liquid quality, is placed in the groove of nodularization bag bottom, by ball
Change bag and be preheated to 620 DEG C, iron liquid is injected into nodularization bag and carries out nodularization and an inoculation, when injection rate is more than 2/3,
The inovulant for adding iron liquid quality 0.25% with stream carries out late inoculation processing, and spheroidization and inoculation treatment temperature is controlled at 1445 DEG C；
3) iron liquid casting after spheroidization and inoculation is handled into sand mold, cast is first slow, in it is fast, rear thin, pouring temperature is
1305 DEG C, obtain spheroidal graphite cast-iron；
4) spheroidal graphite cast-iron is heated to 910 DEG C, is incubated 3h, then hung ground, low speed rotation, from four direction to
Spheroidal graphite cast-iron water spray, makes its temperature be down to 610 DEG C, then is air-cooled to 450 DEG C, and fill-before-fire water smoke to temperature is down to 220 DEG C, then
It is air-cooled to room temperature；
5) nodular cast iron tempering is heated to 365 DEG C, is incubated 2.5h, is air-cooled to room temperature, produces.
Embodiment 3：
A kind of spheroidal graphite cast-iron of high-intensity high-tenacity, is made up of the elemental composition of following mass percent：C 3.2%, Si
3.3%th, Mn 0.5%, Mo 0.5%, Mg 0.01%, Zr 0.05%, Cr0.7%, Ni 0.6%, V 0.2%, Cu
0.3%th, RE 0.02%, surplus is Fe and inevitable impurity.
The preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity, comprises the following steps：
1) raw material is configured, is added it in intermediate frequency furnace, 1020 DEG C are warming up to, 3min is kept, then be warming up to 1480
DEG C melted, obtain original iron melt, come out of the stove；
2) using method is poured in bag, Si-Ba alloy inovulant is covered in rare earth ferrosilicomagnesium nodulizer surface, inovulant adds
It is the 0.4% of iron liquid quality to enter amount, and nodulizer addition is the 1.0% of iron liquid quality, is placed in the groove of nodularization bag bottom, by ball
Change bag and be preheated to 600 DEG C, iron liquid is injected into nodularization bag and carries out nodularization and an inoculation, when injection rate is more than 2/3,
0.25% inovulant for adding iron liquid quality with stream carries out late inoculation processing, and spheroidization and inoculation treatment temperature is controlled 1430
℃；
3) iron liquid casting after spheroidization and inoculation is handled into sand mold, cast is first slow, in it is fast, rear thin, pouring temperature is
1310 DEG C, obtain spheroidal graphite cast-iron；
4) spheroidal graphite cast-iron is heated to 890 DEG C, is incubated 2.5h, is then hung ground, low speed rotation, from four direction
To spheroidal graphite cast-iron water spray, its temperature is down to 600 DEG C, then be air-cooled to 440 DEG C, fill-before-fire water smoke to temperature is down to 210 DEG C,
Room temperature is air-cooled to again；
5) nodular cast iron tempering is heated to 360 DEG C, is incubated 3h, is air-cooled to room temperature, produces.
Embodiment 4：
A kind of spheroidal graphite cast-iron of high-intensity high-tenacity, is made up of the elemental composition of following mass percent：C 3.5%, Si
2.8%th, Mn 0.8%, Mo 0.3%, Mg 0.03%, Zr 0.02%, Cr1.0%, Ni 0.4%, V 0.3%, Cu
0.2%th, RE 0.04%, surplus is Fe and inevitable impurity.
The preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity, comprises the following steps：
1) raw material is configured, is added it in intermediate frequency furnace, 1020 DEG C are warming up to, 4min is kept, then be warming up to 1510
DEG C melted, obtain original iron melt, come out of the stove；
2) using method is poured in bag, Si-Ba alloy inovulant is covered in rare earth ferrosilicomagnesium nodulizer surface, inovulant adds
It is the 0.3% of iron liquid quality to enter amount, and nodulizer addition is the 1.3% of iron liquid quality, is placed in the groove of nodularization bag bottom, by ball
Change bag and be preheated to 650 DEG C, iron liquid is injected into nodularization bag and carries out nodularization and an inoculation, when injection rate is more than 2/3,
The inovulant for adding iron liquid quality 0.2% with stream carries out late inoculation processing, and spheroidization and inoculation treatment temperature is controlled at 1440 DEG C；
3) iron liquid casting after spheroidization and inoculation is handled into sand mold, cast is first slow, in it is fast, rear thin, pouring temperature is
1290 DEG C, obtain spheroidal graphite cast-iron；
4) spheroidal graphite cast-iron is heated to 910 DEG C, is incubated 2h, then hung ground, low speed rotation, from four direction to
Spheroidal graphite cast-iron water spray, makes its temperature be down to 620 DEG C, then is air-cooled to 440 DEG C, and fill-before-fire water smoke to temperature is down to 200 DEG C, then
It is air-cooled to room temperature；
5) nodular cast iron tempering is heated to 380 DEG C, is incubated 2h, is air-cooled to room temperature, produces.
Embodiment 5：
A kind of spheroidal graphite cast-iron of high-intensity high-tenacity, is made up of the elemental composition of following mass percent：C 3.3%, Si
2.9%th, Mn 0.8%, Mo 0.45%, Mg 0.02%, Zr 0.025%, Cr 0.8%, Ni 0.4%, V 0.25%, Cu
0.2%th, RE 0.02%, surplus is Fe and inevitable impurity.
The preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity, comprises the following steps：
1) raw material is configured, is added it in intermediate frequency furnace, 1010 DEG C are warming up to, 4min is kept, then be warming up to 1490
DEG C melted, obtain original iron melt, come out of the stove；
2) using method is poured in bag, Si-Ba alloy inovulant is covered in rare earth ferrosilicomagnesium nodulizer surface, inovulant adds
It is the 0.55% of iron liquid quality to enter amount, and nodulizer addition is the 0.8% of iron liquid quality, is placed in the groove of nodularization bag bottom, will
Nodularization bag is preheated to 600 DEG C, and iron liquid is injected into nodularization bag and carries out nodularization and an inoculation, when injection rate is more than 2/3
When, the inovulant for adding iron liquid quality 0.32% with stream carries out late inoculation processing, and spheroidization and inoculation treatment temperature is controlled 1450
℃；
3) iron liquid casting after spheroidization and inoculation is handled into sand mold, cast is first slow, in it is fast, rear thin, pouring temperature is
1310 DEG C, obtain spheroidal graphite cast-iron；
4) spheroidal graphite cast-iron is heated to 900 DEG C, is incubated 2.5h, is then hung ground, low speed rotation, from four direction
To spheroidal graphite cast-iron water spray, its temperature is down to 610 DEG C, then be air-cooled to 440 DEG C, fill-before-fire water smoke to temperature is down to 210 DEG C,
Room temperature is air-cooled to again；
5) nodular cast iron tempering is heated to 365 DEG C, is incubated 3h, is air-cooled to room temperature, produces.
Performance detection experiment, experiment knot are carried out to the spheroidal graphite cast-iron of 1-5 of the embodiment of the present invention high-intensity high-tenacities prepared
Fruit is as follows：
The Alloy Affecting Ductile Properties index of obtained high-intensity high-tenacity in the embodiment 1-5 of table 1
As can be seen from the table, impact flexibility, the tensile strength of the spheroidal graphite cast-iron of the high-intensity high-tenacity in embodiment 1-5
With the excellent performance such as yield strength.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these modification or
Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. a kind of spheroidal graphite cast-iron of high-intensity high-tenacity, it is characterised in that be made up of the elemental composition of following mass percent：C
3.2-3.5%, Si 2.8-3.3%, Mn 0.5-0.8%, Mo 0.3-0.5%, Mg 0.01-0.03%, Zr 0.02-
0.05%th, Cr 0.7-1.0%, Ni 0.4-0.6%, V 0.2-0.3%, Cu 0.2-0.3%, RE 0.02-0.04%, surplus
For Fe and inevitable impurity, the preparation method of the spheroidal graphite cast-iron of high-intensity high-tenacity comprises the following steps：
1) raw material is configured, is added it in intermediate frequency furnace, 1000-1020 DEG C is warming up to, 3-5min is kept, then be warming up to
1480-1510 DEG C is melted, and obtains original iron melt, is come out of the stove；
2) using method is poured in bag, inovulant is covered in nodulizer surface, is placed in the groove of nodularization bag bottom, nodularization bag is pre-
Iron liquid is injected into nodularization bag to 600-650 DEG C and carries out nodularization and an inoculation by heat, when injection rate is more than 2/3, with
Stream adds inovulant and carries out late inoculation processing, and spheroidization and inoculation treatment temperature is controlled at 1430-1450 DEG C；
3) iron liquid casting after spheroidization and inoculation is handled into sand mold, cast is first slow, in it is fast, rear thin, obtain spheroidal graphite cast-iron；
4) spheroidal graphite cast-iron is heated to 880-920 DEG C, is incubated 2-3h, is then hung ground, low speed rotation, from four direction
To spheroidal graphite cast-iron water spray, its temperature is set to be down to 600-620 DEG C, then be air-cooled to 430-450 DEG C, fill-before-fire water smoke to temperature drop
To 200-220 DEG C, then it is air-cooled to room temperature；
5) nodular cast iron tempering is heated to 360-380 DEG C, is incubated 2-3h, is air-cooled to room temperature, produces.
2. the spheroidal graphite cast-iron of high-intensity high-tenacity as claimed in claim 1, it is characterised in that by the member of following mass percent
Plain composition composition：C 3.4%, Si 3.1%, Mn 0.7%, Mo 0.35%, Mg 0.025%, Zr 0.03%, Cr
0.85%th, Ni 0.45%, V 0.25%, Cu 0.25%, RE 0.025%, surplus are Fe and inevitable impurity.
3. the spheroidal graphite cast-iron of high-intensity high-tenacity as claimed in claim 1, it is characterised in that the step 2) in inovulant be
Si-Ba alloy, addition is the 0.5-1.0% of iron liquid quality, the inovulant that an inoculation and late inoculation processing are added
Mass ratio is 3-4：2.
4. the spheroidal graphite cast-iron of high-intensity high-tenacity as claimed in claim 1, it is characterised in that the step 2) in nodulizer be
Rare earth ferrosilicomagnesium nodulizer, addition is the 0.8-1.3% of iron liquid quality.
5. the spheroidal graphite cast-iron of high-intensity high-tenacity as claimed in claim 1, it is characterised in that the step 3) in pouring temperature
For 1290-1310 DEG C.
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| CN108441752A (en) * | 2018-06-04 | 2018-08-24 | 含山县兴达球墨铸铁厂 | A kind of automobile brake disc spheroidal graphite cast-iron and preparation method thereof |
| CN108950365B (en) * | 2018-07-12 | 2020-02-14 | 佛山市高明康得球铁有限公司 | Preparation method of high-toughness nodular cast iron |
| CN108950364B (en) * | 2018-07-12 | 2020-01-24 | 佛山市高明康得球铁有限公司 | Preparation method of high-wear-resistance nodular cast iron part |
| CN108971431B (en) * | 2018-08-24 | 2020-01-24 | 芜湖泓鹄材料技术有限公司 | Manufacturing method of ductile iron cutter block type casting of automobile stamping die |
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